Children learn attitudes by absorbing them from those around them. One thing they learn is how whole races or religions or cultures are labelled without any consideration of the individuals within the group.
Even you posting that there must be something about Yemeni men, based on your knowledge of a nice one and his family, is a generalisation. I don't doubt that there are some Yemeni men who are not so nice as him, and that there are men from other countries who look similar to him who are just as nice as he is.
Mysterious hole - help please!
Why Are Blokes Obsessed With Noisy Gadgets??
Parents-in-Law. What do/did you call them?
4 Years On…..Health-wise, Has Anything Changed?
Angela Rayner lashes out and calls Sunak “pint sized loser”.